8681555406811 has 24 divisors (see below), whose sum is σ = 10251247420176. Its totient is φ = 7329149593920.

The previous prime is 8681555406761. The next prime is 8681555406893. The reversal of 8681555406811 is 1186045551868.

It is a de Polignac number, because none of the positive numbers 2^k-8681555406811 is a prime.

It is not an unprimeable number, because it can be changed into a prime (8681555416811) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21669565 + ... + 22066561.

It is an arithmetic number, because the mean of its divisors is an integer number (427135309174).

Almost surely, 2^{8681555406811} is an apocalyptic number.

8681555406811 is a deficient number, since it is larger than the sum of its proper divisors (1569692013365).

8681555406811 is a wasteful number, since it uses less digits than its factorization.

8681555406811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 403739 (or 403732 counting only the distinct ones).

The product of its (nonzero) digits is 9216000, while the sum is 58.

The spelling of 8681555406811 in words is "eight trillion, six hundred eighty-one billion, five hundred fifty-five million, four hundred six thousand, eight hundred eleven".